BASE is a scholarly search engine run by Bielefeld University Library. It gathers records from university repositories and other trusted academic collections, then makes them searchable through a simple web page. It points you to the place where the paper lives, and when a free version exists, it links you to it.
BASE focuses on open access. Open access means the author or the publisher has made the paper free to read online. BASE highlights these items so you can filter for them quickly.
The service does not search the full text in most cases. It indexes the bibliographic record, which is the descriptive card for a paper, such as the title, the authors, the year, the abstract, and keywords. You can narrow results using facets, which are menus that let you filter by type, year, subject, language, and more.
BASE is built to harvest data using OAI-PMH, a standard method that lets repositories share their records. It also offers an API for services that want to reuse its index. The index covers hundreds of millions of records from thousands of sources, and a large share are free to read. These traits make BASE a useful partner to tools like Google Scholar when you want strong coverage of theses, preprints, and institutional repositories.
Wikipedia – BASE search engine
Encyclopedia entry that explains what BASE is, who operates it, how it works, and notes that it harvests repository metadata with OAI-PMH, offers an API, and has indexed hundreds of millions of records as of recent years.
University of Cumbria Library – BASE overview
University guide that describes BASE as one of the largest academic search engines, explains that it is operated by Bielefeld University Library, and notes that about six in ten indexed items link to free full text.
ELTE University Library – BASE database entry
Library database record that presents BASE, highlights its open access focus, and repeats that roughly 60 percent of indexed items have free full text.
Maastricht University Library – BASE database page
Library page confirming that BASE is one of the most voluminous search engines for academic web resources, including articles, preprints, images, and research data.
University of Savoie Mont Blanc libraries – BASE description
French university page describing BASE as a search engine specialized in open access publications with about sixty percent of items free to read.
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